Craig,
It's been my experience that sometimes a name is there in the S&S system, but is distinctly difficult to find for various reasons. I'm not saying this is definitely the case in this instance ... but I've learned that persistence is the order of the day in searching there.
I love the S&S system - what a marvelous convenience to those of us searching for ancestors and collateral kin; but one must bear in mind that even at NARA, one runs into problems looking for Confederate records. Took my family about 10 tries to finally locate the "rest" of my Dunaway ancestor's Confederate compiled records cards, as they weren't filed where'd we'd have thought. The same held true with his records on the S&S system.
Penny